<!DOCTYPE html>
<meta charset="utf-8">
<title>RTCEncodedVideoFrame can be cloned and distributed</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src=/resources/testdriver.js></script>
<script src=/resources/testdriver-vendor.js></script>
<script src='../../mediacapture-streams/permission-helper.js'></script>
<script src="../../webrtc/RTCPeerConnection-helper.js"></script>
<script src="../../service-workers/service-worker/resources/test-helpers.sub.js"></script>

<script>
"use strict";
promise_test(async t => {
  const caller = new RTCPeerConnection({encodedInsertableStreams:true});
  t.add_cleanup(() => caller.close());
  const callee = new RTCPeerConnection({encodedInsertableStreams:true});
  t.add_cleanup(() => callee.close());

  await setMediaPermission("granted", ["camera"]);
  const stream = await navigator.mediaDevices.getUserMedia({video:true});
  const videoTrack = stream.getVideoTracks()[0];
  t.add_cleanup(() => videoTrack.stop());

  const videoSender = caller.addTrack(videoTrack)
  const senderStreams = videoSender.createEncodedStreams();
  const senderReader = senderStreams.readable.getReader();
  const senderWriter = senderStreams.writable.getWriter();

  exchangeIceCandidates(caller, callee);

  // Send 10 frames and stop
  const numFramesToSend = 10;

  const framesReceivedCorrectly = new Promise((resolve, reject) => {
    callee.ontrack = async e => {
      const receiverStreams = e.receiver.createEncodedStreams();
      const receiverReader = receiverStreams.readable.getReader();
      const receiverWriter = receiverStreams.writable.getWriter();

      // This should all be able to happen in 5 seconds.
      // For fast failures, uncomment this line.
      // t.step_timeout(reject, 5000);
      for (let i = 0; i < numFramesToSend; i++) {
        const result = await receiverReader.read();
        // Write upstream, purely to avoid "no frame received" error messages
        receiverWriter.write(result.value);
      }
      resolve();
    }
  });

  await exchangeOfferAnswer(caller, callee);

  for (let i = 0; i < numFramesToSend; i++) {
    const result = await senderReader.read();
    senderWriter.write(structuredClone(result.value));
  }
  return framesReceivedCorrectly;
}, "Cloning before sending works");
</script>
